unwanted multiple rows getting inserted in mysql database table

[saumitra chopade]

i have a long running php script at the end of which i am inserting one row of data in one of the database tables. i am using simple insert statement and i have tried verious styles (insert ... set ... values, insert ... delayed...) etc. but occassionally multiple rows of the same data get inserted when i want only one row. this does not happen often but happens in few cases. one thing observed is that the scirpt inserts only one row everytime when it is called via a form submission (like - <form action="script_name.php" method="post"> ) but iserts multiple rows when called directly passing the data in querystring (like - script_name.php?q=xyz&cbid=abc). any idea why this is happening?